diff --git a/tests/manual/gdbdebugger/simple/app.cpp b/tests/manual/gdbdebugger/simple/app.cpp
index 9bf48786c15..7cc43494dd4 100644
--- a/tests/manual/gdbdebugger/simple/app.cpp
+++ b/tests/manual/gdbdebugger/simple/app.cpp
@@ -71,9 +71,9 @@
 #include <string>
 #include <vector>
 
-#define USE_GCC_EXT 1
-#if USE_GCC_EXT
-#include <hash_set>
+#if defined(__GNUC__)
+#    define USE_GCC_EXT 1
+#    include <hash_set>
 #endif
 
 #ifdef Q_OS_WIN